The mean of 8 number is 27 . If one number is added , then the mean is 26Find the added number.
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Step-by-step explanation:
mean =27
no. of observation =8
total = 27× 8= 216
new mean =26
no. of observaation = 8+1=9
total = 26×9= 234
added number = 234-216= 18
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